WO2005026815A1 - 光路切換装置 - Google Patents
光路切換装置 Download PDFInfo
- Publication number
- WO2005026815A1 WO2005026815A1 PCT/JP2004/013172 JP2004013172W WO2005026815A1 WO 2005026815 A1 WO2005026815 A1 WO 2005026815A1 JP 2004013172 W JP2004013172 W JP 2004013172W WO 2005026815 A1 WO2005026815 A1 WO 2005026815A1
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- WO
- WIPO (PCT)
- Prior art keywords
- optical
- path switching
- optical path
- switching device
- light
- Prior art date
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/35—Optical coupling means having switching means
- G02B6/354—Switching arrangements, i.e. number of input/output ports and interconnection types
- G02B6/3562—Switch of the bypass type, i.e. enabling a change of path in a network, e.g. to bypass a failed element in the network
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/35—Optical coupling means having switching means
- G02B6/3564—Mechanical details of the actuation mechanism associated with the moving element or mounting mechanism details
- G02B6/3582—Housing means or package or arranging details of the switching elements, e.g. for thermal isolation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/35—Optical coupling means having switching means
- G02B6/351—Optical coupling means having switching means involving stationary waveguides with moving interposed optical elements
- G02B6/3512—Optical coupling means having switching means involving stationary waveguides with moving interposed optical elements the optical element being reflective, e.g. mirror
- G02B6/352—Optical coupling means having switching means involving stationary waveguides with moving interposed optical elements the optical element being reflective, e.g. mirror the reflective optical element having a shaped reflective surface, e.g. a reflective element comprising several reflective surfaces or facets that function together
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/35—Optical coupling means having switching means
- G02B6/3586—Control or adjustment details, e.g. calibrating
Definitions
- the present invention relates to a failure-time optical path switching device used for switching lines when a failure occurs in an optical communication field such as an optical communication network and an optical LAN.
- FIG. 1 is a diagram for explaining a 1 + 1 failure recovery method adopted in a point-to-point optical communication network, where a) describes a case where there is no failure and b) describes a case where a failure occurs.
- FIG. 1 is a diagram for explaining a 1 + 1 failure recovery method adopted in a point-to-point optical communication network, where a) describes a case where there is no failure and b) describes a case where a failure occurs.
- the 1 + 1 failure recovery method consists of an optical transmitter 1, an optical receiver 2, an optical fiber power cable 3, a working line 4 composed of optical fibers, a protection line 5 composed of optical fibers, It comprises a device 6 and a receiving line 9.
- the optical communication signal 7 from the optical transmitter 1 is split by the optical fiber power bracket 3 into the optical communication signals 7-1 and 7-2 of the working line 4 and the protection line 5.
- the failure-time optical path switching device 6 sends the optical communication signal 7-1 of the four working lines to the optical receiver 2 via the receiving line 9 as the received optical communication signal 8.
- the failure-time optical path switching device 6 sends the optical communication signal 7-2 from the protection line 5 as the received optical communication signal 8 to the optical receiver 2 via the receiving line 9 To do.
- FIG. 2 is a block diagram of the optical path switching device 6 in the event of a failure.
- It consists of an optical switch 13 with two input ports and one output port, electrical wiring 14-1 and 14-2, electrification box 15 and electrical wiring 16.
- the optical communication signal 7-1 of the working line 4 is transmitted to the receiving line 9 via the optical switch 13.
- a part of the optical communication signal of the working line 4 (usually the optical communication signal power of 5% or less) is taken out by the optical tap circuit 11-1, converted into an electric signal by the photodiode 12-1, and converted into an electric signal.
- Electronic The task 15 monitors the transmission state of the optical communication signal 7-1 of the working line 4 by constantly monitoring the electric signal from the photodiode 12-1. If the electric signal cannot be received, it is determined that a failure has occurred in the working line 4, and the electronics 15 sends an optical switch switching electric signal to the optical switch 13 via the electric wiring 16. As a result, the optical path of the optical switch 13 is switched, and the optical communication signal 7-2 from the protection line 5 is sent to the receiving line 9 via the optical switch 13.
- the electronics 15 sends the electric signal for switching the optical switch to the optical switch 13 through the electric wiring 16. Transmit and return so that the optical communication signal 7-1 of the four working lines is sent to the receiving line 9. In this way, the failure of the optical communication network is restored.
- the electronics 15 also constantly monitors the electric signal input via the optical tap circuit 11-2 and the photodiode 12-2 for the protection line 5 so that the protection line 5 Monitor the transmission status of optical communication signal 7-2.
- FIG. 3 is a diagram for explaining a conventional example in which the block diagram of the optical path switching device at the time of failure of FIG. 2 is implemented.
- the conventional optical path switching device in the event of a fault comprises an optical fiber coupler 21-1 and 21-2 functioning as an optical tap circuit, photodiodes 22-1 and 22-2, an optical switch 23, and an electrical wiring 24-1. 24-2, electronics 25, and electrical wiring 26. These are mounted on a printed board 28.
- the optical fiber couplers 21-1 and 21-2, the photodiodes 22-1 and 22-2, and the optical switch 23 use components having a fiber bigtile structure, respectively. For this purpose, these parts are connected at the optical fiber connection parts 27-11, 27-12, 27-21, 27-22 by a fusion method or a bonding method as shown in the figure. .
- the photodiodes 22-1, 22-2 and electronics 25 are connected by electrical wiring 24-1, 24-2!
- the electronics 25 and the optical switch 23 are connected by electrical wiring 26.
- the fiber bigils of the optical fiber couplers 21-1 and 21-2 and the optical switch 23 are connected to optical connectors 29-1, 29-2 and 29-3 as shown in the figure.
- the conventional optical path switching device at the time of a fault configured as described above has a function of switching to the protection line 5 and transmitting the optical communication signal to the receiving line 9 without any trouble when the working line 4 fails.
- Patent Document 1 JP 2001-350105A Disclosure of the invention
- the conventional optical path switching device in the event of a fault has the disadvantage that it is large and expensive. This will be specifically described below.
- optical fiber power switch, photodiode, and optical switch used in the conventional optical path switching device in the event of a fault are each in the form of individual components, and each component requires packaging to ensure reliability. is there. As a result, the size of each component is increased, and the number of members and man-hours required for packaging are increased, resulting in high cost.
- each component since each component has a fiber bigtle structure, the force required to connect the fibers by fusion or bonding between components requires a connection work space of at least about 3 cm. It cannot be arranged and it becomes large.
- the optical fiber connection in a narrow space requires a high level of technology, so that the operation cost is high.
- FIG. 3 shows an optical fiber pre-lengthening process for clarity. However, since the optical fiber is not sharply bent, an optical fiber pre-lengthening process is required to provide a margin for the optical fiber, and the trouble is caused. The time optical path switching device is further increased in size.
- an invention according to claim 1 is an optical path switching device including an optical input unit, an optical path switching unit, an optical output unit, an optical branching unit, and an optical signal detection unit, wherein the optical input unit, At least two of the optical path switching means, the optical output means, the optical branching means, and the optical signal detecting means are assembled on the platform.
- the invention according to claim 2 is characterized in that the light input means and the light output means include a member having a lens function.
- the invention according to claim 3 is characterized in that the light beams emitted from the light input means are substantially parallel.
- the invention according to claim 4 is characterized in that the optical path switching means comprises a prism.
- the invention according to claim 5 is characterized in that the moving means of the optical path switching means is an electromagnetic actuator.
- the invention according to claim 6 is characterized in that the input means is plural, and an optical signal detection means corresponding to each input means is provided, and each of the input detection means comprises a photoelectric conversion element, Each is assembled on the same platform, and the moving means of the optical path switching means is an electromagnetic actuator.
- the invention according to claim 7 is characterized in that the material of the platform is metal, and the invention according to claim 8 is characterized in that the material of the platform is a sintered material.
- the invention according to claim 9 is characterized in that the material of the platform is plastic.
- the invention according to claim 10 is characterized in that the material of the platform is glass.
- the invention according to claim 11 is characterized in that an electric signal from the optical signal detecting means is amplified.
- the invention according to claim 12 is characterized in that a converging lens is provided between the optical branching unit and the optical signal detecting unit.
- the invention according to claim 13 is characterized in that the optical path is switched by detecting that the light amount of the input signal is not within a predetermined range based on the optical signal detecting means.
- the invention according to claim 14 is characterized in that an optical input means for emitting a light beam which also serves as an optical fiber collimator, an output means for receiving a light beam comprising an optical fiber collimator, and the input means and the emitting means are provided.
- Presence Control means for transmitting an electric signal to the actuator when a failure occurs, and any one of the optical fiber collimator, the actuator connected to the movable prism, the fixed prism, the optical tap element, and the light receiving element. At least two are assembled to a platform, and the input means, the switching means, the output means, and the monitoring means are connected by a light beam.
- the invention according to claim 15 is characterized in that there are a plurality of the input means, and a monitoring means for monitoring at least two of the light beams from the input means.
- the invention according to claim 16 is characterized in that a condenser lens is provided between the tap element and the light receiving element.
- an absorber portion is provided on the fixed prism, and one of the incident light beams is provided. One is projected on the absorber part.
- the invention according to claim 18 is characterized in that an absorber portion is provided on the movable prism, and one of the incident light beams is projected on the absorber portion.
- each of the optical input means, the optical path switching means, the optical output means, the optical branching means and the optical signal detecting means since each of the optical input means, the optical path switching means, the optical output means, the optical branching means and the optical signal detecting means is directly coupled by a light beam, it corresponds to the optical fiber extra length processing.
- This has the advantage that the required space can be reduced and the size can be reduced as compared with the conventional one, and the complicated optical fiber connection work can be reduced and the cost can be reduced.
- the platform plays the role of an optical surface plate, the positioning accuracy and angle accuracy can be easily increased, so that the assembling work is easy, good optical performance is obtained, and long-term stability is excellent. There are advantages.
- the light input means and the light output means include members having a lens function, there is an advantage that the coupling efficiency of the light beam propagating to the light output means can be increased and the loss can be reduced.
- the distance between the light input means and the light output means can be reduced, so that there is an advantage that the size can be further reduced.
- optical path switching means by using a prism as the optical path switching means, there is an advantage that low loss and low cost can be achieved as compared with other optical path switching means such as a magneto-optical effect element, a liquid crystal element, and a MACH-ZEHNDER thermo-optical element.
- the moving means of the optical path switching means is an electromagnetic actuator, a drive which requires less power consumption than other driving sources such as static electricity and electric field is generated. There is an advantage that high reliability can be obtained due to large force.
- the material of the platform can be processed with higher precision than metal, there is an advantage that a good optical performance can be obtained and the long-term stability is also excellent.
- the invention of claim 10 there is an advantage that a high-precision finished surface can be obtained without performing special processing, so that good optical performance can be easily obtained and long-term stability is excellent.
- a highly reliable optical communication system can be provided because a disconnection fault can be detected stably even in an environment having electromagnetic interference.
- the light signal detection area can be reduced by the condenser lens provided between the light branching means and the light signal detection means. It has the advantage of providing an optical communication system with high reliability.
- the invention of claim 13 since the disconnection failure can be quantitatively detected, there is an advantage that an optical communication system with higher reliability can be provided.
- the optical path switching device of the present invention includes an optical fiber collimator, an optical tap element, a fixed prism, a movable prism, a photodiode, and an actuator for moving the movable prism.
- the size and size of the packaging can be greatly reduced compared to the conventional optical path switching device that uses individually packed optical fiber power switches, photodiodes, and optical switches.
- the cost can be reduced due to the reduction in the number of steps.
- the platform plays the role of an optical surface plate, the alignment accuracy and the angular accuracy can be easily increased, so that the assembling work is easy, good optical performance is obtained, and long-term stability is excellent. There are points.
- the detection of the disconnection failure can be performed at high speed. This has the advantage that a more reliable optical communication system can be provided.
- FIGS. 4 to 7 are diagrams for explaining the optical path switching device at the time of failure according to the present invention.
- FIG. 4 is a top view showing the configuration of the optical path switching device at the time of failure.
- the optical path switching device 31 at the time of failure is composed of optical fiber collimators 32-1 and 32-2 (input means), optical fiber collimator 32-3 (output means), optical tap elements 33-1, 33-2, and a photodiode.
- 36-1, 36—2 monitoring means
- fixed prism 34 and movable prism 35 switching means
- platform 37, package case 38, and electronics 39 control means.
- the optical fiber collimators 32-1, 32-2 and 32-3 are arranged in parallel as shown in FIG.
- Each optical fiber collimator consists of an optical fiber and a lens fixed to the tip.
- an optical fiber collimator 32-1 consists of an optical fiber 32-la and a lens 32-lb, and a lens 32-32 lb.
- a lens that has a lens action such as a spherical lens, a drum lens, or a GRIN lens whose refractive index changes with location.
- the fixed prism 34 and the movable prism 35 are right-angle prisms made of glass, and two sides forming a right angle are coated with a reflection film for reflecting incident light as necessary.
- a light absorber 40 is attached to the oblique side of the fixed prism 34 as shown.
- a light absorber 41 is attached to the movable prism 35 on one of the surfaces forming a right angle as shown in the figure.
- a coating film of black paint is used for the light absorber.
- the fixed prism 34 is arranged so that the light beam 42-1 from the optical fiber collimator 32-1 is incident on the optical fiber collimator 32-3.
- the movable prism 35 is arranged such that when the prism is inserted into the optical path of the light beam 42-2 from the optical fiber collimator 32-2, the light beam 42-2 is incident on the optical fiber collimator 32-3.
- the movable prism 35 is arranged at a position closer to the optical fiber collimators 32-1, 32-2, and 32-3 than the fixed prism.
- the optical tap elements 33-1 and 33-2 are for reflecting a light beam with a predetermined reflectance, and are, for example, plate-shaped in which a glass platform is coated with a multilayer reflective film.
- the reflectance is set so that the amount of light can be monitored. In practice, it is often around 5%.
- the optical tap elements 33-1 and 33-2 enter the optical paths of the light beams 42-1 and 42-2, respectively, and take out the tap light beams 42-11 and 42-21 at an angle of about 90 degrees.
- the photodiodes 36-1 and 36-2 are arranged at an angle of about 90 degrees with the light beams 42-1 and 42-2 so that they can receive the tap light beams 42-11 and 42-21, respectively.
- optical fiber collimators 32-1, 32-2, 32-3, fixed prism 35, optical tap elements 34-1, 34-2, and photodiodes 37-1, 37-2 are positioned as described above. Attach it to the platform 37 by bonding or other means.
- the movable prism 35 can be inserted into the optical path of the light beam 42-2 through a hole 46 provided in the platform 37.
- the movable prism 35 is connected to the actuator 45 (moving means) as shown in FIG.
- the actuator 45 is driven by an electric signal from the electric wiring 46. Move the movable prism 35 up and down.
- the actuator 45 one having a direct acting function such as a solenoid is used.
- the actuator 45 is mounted on the platform 37 so that the movable prism 35 is at a predetermined position with respect to the light beam 42-2.
- the optical fiber collimators 32-1 and 32-2 are connected to the working line and the protection line, respectively, and the optical fiber collimator 32-3 is connected to the receiving line.
- the optical path switching device in the event of a fault uses a small optical tap element that is not packaged, a small optical switch that is not knocked, and a photodiode as element parts.
- the component parts are assembled on a single platform, and the component parts are connected by a light beam, enabling miniaturization and low cost.
- FIG. 6 shows the monitoring status when there is no failure in the working line!
- the movable prism 35 is set at a position below the platform 37.
- the optical beam 42-1 of the working line is input to the optical fiber collimator 32-3 via the fixed prism 34, and then transmitted as the received optical communication signal 8.
- the light beam 42-2 of the protection line is absorbed by the light absorber 40.
- the monitoring of the working line is performed as follows. A part 42-11 of the light beam of the working line is taken out by the optical tap element 33-1, converted into an electric signal by the photodiode 36-1 and sent to the electronics 39 via the electric line 43-1.
- the electronics 39 monitors the transmission state of the optical communication signal 7-1 of the working line by monitoring the electric signal from the photodiode 37-1. If the electrical signal cannot be received, it is determined that the working line has failed, and the electronics 39 sends the movable prism to the actuator 45 via the electrical wiring 44. An electric signal is sent to move 35 upward.
- the movable prism 35 is inserted into the optical path of the light beam 42-2 of the protection line, and the optical communication signal 7-2 of the protection line is transmitted as the received optical communication signal 8. Is done. In this way, when the failure 9 occurs, the working line is switched to the protection line, and optical communication can be performed without any trouble on the receiving line.
- the photodiode 36-1 again sends an electrical signal to the electronics 39, and the electronics 39 returns the movable prism 35 to its original position below the platform 37. Sends the electrical signal to the actuator 45 and returns it to its original state.
- the electronics 39 constantly monitors the electric signal input through the optical tap element 33-2 and the photodiode 36-2 to transmit the optical communication signal of the protection line. Monitor status
- the role of the 2 XI optical switch by the optical fiber collimators 32-1, 32-2, 32-3, the fixed prism 34, the movable prism 35, and the actuator 45 is described.
- the optical tap elements 33-1 and 33-2, the photodiodes 36-1 and 36-2, and the elect port 39 function as a line monitoring function, and these functions are integrated. It is a dagger.
- FIGS. 8-11 are diagrams for explaining another embodiment of the optical path switching device at the time of failure according to the present invention.
- Figure 8 schematically shows a ring optical communication network, in which a working line 51 and a protection line 52 made of optical finos are laid in a ring as a pair of communication lines, and a base station is installed at a predetermined location in the communication line.
- An example is shown in which 53-1, 53-2, and 53-3 are provided.
- the basic configuration of the base station 53-1 includes a failure-stage optical path switching device 54-1 at the preceding stage, a failure-time optical path switching device 54-2 at the subsequent stage, and an optical add / drop device 55.
- the optical path switching device 54-1 at the time of a failure at the preceding stage has a 2 ⁇ 2 optical switch function and a function of monitoring the working line 51. Further, the optical path switching device 54-2 at the subsequent stage has a 2 ⁇ 2 optical switch function and a function of monitoring the protection line 52.
- the optical add / drop device 55 drops only a predetermined optical communication signal from a plurality of optical communication signals transmitted on the working line 51, and converts a plurality of optical communication signals transmitting on the working line 51 into a predetermined optical communication signal. It has a function of adding a communication signal.
- FIG. 10 shows the configuration of the optical path switching device 61 in the event of a fault.
- the optical fiber collimators 61-1, 61-2, 61-3, 61-4, the optical tap element 62, and the fixed prisms 63-1, 63-1 — 2, movable prism 64, photodiode 65, platform 66, actuator 67 (not shown because it is located at the bottom of platform 66), package case 68, and -Power is also provided by the task 69 and the hole 70 provided in the platform.
- the ends of the optical fiber collimators 61-1, 61-2, 61-3, and 61-4 are a, b, c, and d, respectively.
- a part of the optical communication signal input to the end a is taken out by the optical tap element 62, converted into an electric signal by the photodiode 65, sent to the electronics 69, and used for monitoring the transmission state of the optical communication signal. .
- FIG. 10 shows a state in which the movable prism 64 is set at the lower position.
- the end a and the end b are connected, and the end c and the end d are connected.
- an electrical signal for switching the optical switch is sent from the actuator 69 to the actuator 67, as shown in FIG. 11, the movable prism 64 moves to the upper position, and the ends a and d are connected. End c and end b are connected It is.
- the optical path switching device at the preceding stage connects the end a to the input side of the working line 51, connects the end b to the input side of the optical add / drop device, and connects the end c to the subsequent stage. Connect to end b of the optical path switching device in the event of a fault, and connect end d to the output side of the protection line 52.
- the optical path switching device at the subsequent stage connects the terminal a to the input side of the protection line 52, connects the terminal b to the terminal c of the optical path switching device at the preceding stage, and connects the terminal c to the optical address. 'Connect to the output side of the drop device, and connect end d to the output side of the working line 51.
- a procedure for setting up a bypass line when a failure 56 as shown in FIG. 9 occurs between the base stations 53-1 and 53-2 will be described.
- the occurrence of the failure 56 is detected by the optical path switching device 56-1 at the stage preceding the base station 53-2. Therefore, the optical path switching device 57-1 at the time of failure is driven to connect the protection line 52 and the working line 51.
- the base station 53-1 is notified that the failure 56 has occurred.
- the base station 53-1 immediately drives the downstream optical path switching device 54-2 at the subsequent stage to connect the working line 51 and the protection line 52. In this way, as shown in FIG. 8, a bypass line composed of the working line 51 and the protection line 52 is set, and interruption of optical communication due to a failure can be avoided.
- the normal optical communication state is restored by returning the original optical path switching device 57-1 of the base station 53-1 and the optical path switching device 54-2 of the base station 53-1 to the failure. .
- the optical path switching device of the present invention can reduce the space corresponding to the extra processing of the optical fiber and reduce the size compared to the conventional one, and can reduce the complicated optical fiber connection work and reduce the cost.
- the area occupied by mounting the optical path switching device of the present invention on a printed board is reduced to at least 1Z20 as compared with the conventional one.
- a force platform in which an optical fiber collimator, an optical tap element, a fixed prism, a movable prism, and a photodiode are assembled on a platform and coupled by a light beam is used. Since it fulfills the role of a board, it is easy to achieve an alignment accuracy of 0.5 m and an angular accuracy of 0.01 degrees, which facilitates assembly work, provides good optical performance, and has long-term stability. There are excellent advantages.
- the present invention can be applied to an optical communication device used in an optical communication field such as an optical information network and an optical LAN (Local Area Network).
- an optical communication device used in an optical communication field such as an optical information network and an optical LAN (Local Area Network).
- optical LAN Local Area Network
- FIG. 1 is a diagram for explaining an example of line switching at the time of failure used in a point-to-point optical communication network.
- FIG. 2 is a block diagram of an optical path switching device at the time of failure.
- FIG. 3 is an example of a conventional optical path switching device at the time of failure.
- FIG. 4 is a perspective view of the optical path switching device at the time of failure according to an embodiment of the present invention.
- FIG. 5 is a view for explaining a movable prism and an actuator of the optical path switching device at the time of failure according to an embodiment of the present invention.
- FIG. 6 is a diagram for explaining an operation when no failure has occurred in the failure-time optical path switching device according to one embodiment of the present invention.
- FIG. 7 is a diagram for explaining an operation when a failure occurs in the optical path switching device at the time of failure according to an embodiment of the present invention.
- FIG. 8 is a diagram for explaining an example of line switching at the time of failure used in a ring optical communication network.
- FIG. 9 is a diagram for explaining an operation of the optical path switching device at the time of failure when a failure occurs.
- FIG. 10 is a perspective view of an optical path switching device at the time of failure according to another embodiment of the present invention, which is a diagram for explaining an operation in a case where a failure has occurred.
- FIG. 11 is a diagram for explaining an operation when a failure occurs in a failure-time optical path switching device according to another embodiment of the present invention.
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Abstract
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JP2005513902A JPWO2005026815A1 (ja) | 2003-09-10 | 2004-09-09 | 光路切換装置 |
CA002521131A CA2521131A1 (en) | 2003-09-10 | 2004-09-09 | Optical path switching device |
US11/074,566 US7561799B2 (en) | 2003-09-10 | 2005-03-08 | Optical path switching device |
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JP2003-319098 | 2003-09-10 | ||
JP2003319098 | 2003-09-10 |
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US11/074,566 Continuation US7561799B2 (en) | 2003-09-10 | 2005-03-08 | Optical path switching device |
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JP (1) | JPWO2005026815A1 (ja) |
CA (1) | CA2521131A1 (ja) |
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EP3329615B1 (en) * | 2015-07-27 | 2021-04-21 | Telefonaktiebolaget LM Ericsson (publ) | Apparatus for protecting an optical link |
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US11245970B1 (en) * | 2020-01-14 | 2022-02-08 | Cable Television Laboratories, Inc. | Redundancy architectures and links |
JP7464875B2 (ja) * | 2020-03-13 | 2024-04-10 | 日本電信電話株式会社 | 光伝送装置及び光伝送方法 |
CN116626819A (zh) * | 2022-02-14 | 2023-08-22 | 宁波环球广电科技有限公司 | 光模块 |
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JPS6340121A (ja) * | 1986-08-05 | 1988-02-20 | Toyota Motor Corp | 光路切換制御装置 |
JPS6437524A (en) * | 1987-08-03 | 1989-02-08 | Mitsubishi Electric Corp | Optical switching module |
JPH01188806A (ja) * | 1988-01-22 | 1989-07-28 | Nippon Telegr & Teleph Corp <Ntt> | 多層膜フィルタ付き受光器およびその製造方法 |
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JPS6437524U (ja) | 1987-08-27 | 1989-03-07 | ||
US6115154A (en) * | 1998-09-18 | 2000-09-05 | Telcordia Technologies, Inc. | Method and system for detecting loss of signal in wavelength division multiplexed systems |
US6289148B1 (en) * | 1998-12-14 | 2001-09-11 | At&T Corporation | Free-space micro-mirror wavelength add/drop multiplexers with full connectivity for two-fiber ring networks |
US6243511B1 (en) * | 1999-02-04 | 2001-06-05 | Optical Switch Corporation | System and method for determining the condition of an optical signal |
JP2001350105A (ja) | 2000-06-08 | 2001-12-21 | Oyokoden Lab Co Ltd | 光スイッチ |
US6363182B2 (en) * | 2000-07-31 | 2002-03-26 | James D. Mills | Optical switch for reciprocal traffic |
AU2003256690A1 (en) * | 2002-07-24 | 2004-02-09 | Ciena Corporation | Method and system for providing protection in an optical communication network |
-
2004
- 2004-09-09 JP JP2005513902A patent/JPWO2005026815A1/ja active Pending
- 2004-09-09 CA CA002521131A patent/CA2521131A1/en not_active Abandoned
- 2004-09-09 WO PCT/JP2004/013172 patent/WO2005026815A1/ja active Application Filing
-
2005
- 2005-03-08 US US11/074,566 patent/US7561799B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS62199704U (ja) * | 1986-06-09 | 1987-12-19 | ||
JPS6340121A (ja) * | 1986-08-05 | 1988-02-20 | Toyota Motor Corp | 光路切換制御装置 |
JPS6437524A (en) * | 1987-08-03 | 1989-02-08 | Mitsubishi Electric Corp | Optical switching module |
JPH01188806A (ja) * | 1988-01-22 | 1989-07-28 | Nippon Telegr & Teleph Corp <Ntt> | 多層膜フィルタ付き受光器およびその製造方法 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN103236881A (zh) * | 2013-05-02 | 2013-08-07 | 刘一 | 一种自由空间光通信保护装置 |
JP2017181765A (ja) * | 2016-03-30 | 2017-10-05 | Seiオプティフロンティア株式会社 | 光切替ユニット及び光切替装置 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2005026815A1 (ja) | 2006-11-24 |
US7561799B2 (en) | 2009-07-14 |
US20050201750A1 (en) | 2005-09-15 |
CA2521131A1 (en) | 2005-03-10 |
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